0.10-0.15mm off from what? Do you have the exact correct thickness measure?
regards, /Jonas
My CQ adapter, which gives correct focus at infinity, measures 8.58-8.60mm thick as measured at several points around the circumference. This measurement is taken between the flats of the front and rear flanges.
My RJ adapter, as received, did not allow lenses to focus to infinity, and measured 8.68-8.71mm at several points around the circumferences. So, I concluded that on average, it was about 0.10mm too thick.
This is less than the deviation quoted in the messages several of us have received from RJ; apparently he is finding some that are too thick by a matter of 0.15mm to 0.20mm.
Either way, this is a big enough difference that it should be easily detectable, even allowing for possible calibration differences among inexpensive calipers. If your adapter measures about 8.60mm between the flats, plus or minus a mm or two, it's probably from the "good" batch; if it measures about 8.70mm or more, it's probably from the "too thick" batch.
Of course, the only real test is to mount a known-good lens on the camera using the adapter, and make sure it can bring a really distant object (1km or more) into focus when the lens is set to infinity. But if you don't yet own a Micro Four Thirds camera but already own an adapter, this type of measurement should be able to give you advance warning of potential problems.
Incidentally, for real measurement nerds only: If you look carefully at the rear surface of either adapter, you'll notice it is "stepped" -- there is an outer ridge that does not contact the mounting flange on the G1 camera. Since this ridge adds to the thickness when measuring across the flats, a careful machinist might object that this makes my measurement inaccurate.
Technically this is true -- but, as best I can measure (my depth gauge is too coarse for a really accurate measurement of such a small part) the "step" is only about 0.02mm high. This is relatively small compared to the deviation between the "good" and "too thick" adapters, so I think it can be ignored safely for this purpose. You'd need a micrometer rather than a caliper to measure the non-stepped area, and I don't have one of those (yet; maybe that's the next measurement toy I should add to my collection!)